Term
| what are the 3 layers of the heart walls? |
|
Definition
epicardium
myocardium
endocardium |
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|
Term
| which nerve system controls the muscle fibers? |
|
Definition
| sympathetic nervous system |
|
|
Term
| name the 2 filaments that make the muscle fibers |
|
Definition
|
|
Term
| what is the name of the functional unit of muscle? |
|
Definition
|
|
Term
| what is the job of the gap junctions? |
|
Definition
| spread of the action potential |
|
|
Term
| what is the job of desmosomes? |
|
Definition
| they act like cement and hold cells togehter. |
|
|
Term
|
Definition
| separate one sarcomere from the next. |
|
|
Term
|
Definition
| a darker area within the sarcomere that contains mostly thick filaments. |
|
|
Term
|
Definition
| a lighter area that contains mostly thin filaments. |
|
|
Term
|
Definition
| a narrow zone in the middle of the A band that contains thick filaments. |
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|
Term
|
Definition
|
|
Term
| what is sarcoplasmic reticulum? |
|
Definition
| acts as a storage house for Ca. |
|
|
Term
|
Definition
| the plasma membrane that surrounds the cytoplasm. |
|
|
Term
| name the 3 ions that paly a key role in the action potential . |
|
Definition
|
|
Term
| what is the resting potential of cardiac muscle fiber? |
|
Definition
|
|
Term
| what happens when Na flowing into the myocyte in phase 1? |
|
Definition
| this changes the voltage from -90mV to +30 |
|
|
Term
|
Definition
| cardiac muscle contraction. |
|
|
Term
| how long does a depolarization last? |
|
Definition
|
|
Term
|
Definition
| relaxation phase of a cardiac muscle. |
|
|
Term
| how long does a repolarization last? |
|
Definition
| 1/3 of the cardiac cycle. |
|
|
Term
| what is absolute refractory period? |
|
Definition
| from phase one until phase 3 the cell would not be excitable and no contraction can occur. |
|
|
Term
| what are the 2 proteins that are part of the actin filaments? |
|
Definition
|
|
Term
| what is the normal herar beat? |
|
Definition
|
|
Term
| what is the fibrous skeleton of the heart that prohibits the action potential from spreading through the atria directly to the ventricles? |
|
Definition
|
|
Term
| what is the main pacemake of a heart that beats 20-40 beats per min? |
|
Definition
|
|
Term
| what is the heart rate if the AV node causes the heart to contract? |
|
Definition
|
|
Term
| what is the job of parasympathetic nervous system? |
|
Definition
| causing the heart to slow down. |
|
|
Term
| what is the job of the sympathetic nervous system? |
|
Definition
|
|
Term
|
Definition
| first positive deflection that represents SA node depolarization and atrial contraction. |
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|
Term
|
Definition
| shows the ventricular depolarization. |
|
|
Term
| what is the order of S1 heart sound? |
|
Definition
|
|
Term
|
Definition
| the pressure the ventricle must eject blood against is afterload. |
|
|
Term
| what is the end diastolic volume? |
|
Definition
| the volume of the blood inside the ventricle at the end of filling in the maximal volume it will hold. |
|
|
Term
| at which phase atria acts a a conduit? |
|
Definition
|
|
Term
| during which phase the atria act as a reservoir? |
|
Definition
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